According to the Purana, in the Satya Yuga, King Daksha (Son of Lord Bramha) arranged a ritual called Yagya in which hisr daughter Goddess Sati and Her husband "Lord Shiva" was not invited. Still Goddess Sati attended the function. Unable to bear the insult towards Her husband Lord Shiva, Goddess Sati protested by sacrificing Herself into the fire of the Yagna.
Enraged with grief, Lord Shiva started the dance of destruction across the Universe with the corpse of Goddess Sati on His shoulder. To stop this, Lord Vishnu cut the corpse of Goddess Sati with the Sudharshan Chakra and as a result the various pieces of Goddess Sati's body and Her ornaments fell at various places of the Indian subcontinent.
These places are now known as Shakti Pithas.Shakti Pithas are holy abode of the Mother Goddess. Each temple have shrines for Shakti and Kalabhairava. The Shakti of Bhabanipur shrine is addressed as "Aparna"and the "Bhairava" as "Vaman". It is believed that Sati Devi's Left anklet fell here.
There is a legend saying that while once a conch-bangles dealer was passing by the side of a lonely pond in a dense jungle near the then Bhabanipur temple, a little girl with a tip of vermilion on her forehead approached him and told him that she was the daughter of the Natore Rajbari (Palace).
She bought a pair of conch-bangles from him and requested him to collect the price of that bangles from the then Maharani Bhabani from a basket kept in the Rajbari at a specified place. Her appearance and polite words overwhelmed the conch-dealer. The Maharani (Queen) rushed to the place/site with her men and the conch-dealer as soon as she heard this from him.
On the earnest prayer by the conch-dealer, Ma Bhabani raised from that pond showing her two wrists with the conch-bangles worn. The Maharani and the men present there were surprised, and the divinity of Mother Bhabani spread throughout this subcontinent. This is that sacred "Shakha-Pukur" (conch-bangles pond) where the devotees take their holy bath when they go there.